采用红外光谱、紫外光谱、原子吸收光谱及元素分析研究了三乙烯四胺基双(二硫代甲酸钠)(DTC-TETA)的结构及其重金属配合物的配位行为。在DTC-TETA的红外光谱图中,在1461-1388cm^-1处和1174-996cm^-1处分别出现含有部分双键性质的〖JG(C〖ZJXS,YN键和键的特征吸收峰;在紫外光谱图中,分别在265和290 nm处出现两个最大吸收峰,分别对应于N…C…S基团的π—π*跃迁和S…C…S基团中硫原子上非键电子向共轭体系的n—π*跃迁;元素分析结果表明该化合物中碳、氢、氮、硫的摩尔比近似为2:4:1:1。在Cu(Ⅱ),Cd(Ⅱ),Zn(Ⅱ),Ni(Ⅱ)配合物的紫外光谱图中分别在紫外区的321,310,311,325 nm处出现新的最大吸收峰。流动注射与火焰原子吸收联用分析结果表明DTC-TETA对铜、镉、镍、锌等重金属离子的络合能力强于二乙基二硫代氨基甲酸钠(DDTC)。

A sodion triethylenetetramine-bisdithiocarbamate(DTC-TETA) and its complexes with heavy metal ions were investigated by FTIR,UV,FAAS and elemental analysis,respectively.The FTIR spectrum of DTC-TETA showed strong absorption peaks at 1 461-1 388 cm^-1 and 1 174-996 cm-1 which were attributed to partly double bonds of C and C,respectively.The UV spectrum of DTC-TETA had two absorption peaks at 265 and 290 nm,assigned to π—π* transition of N…C…S radical and nonbonding electron n—π* transition of S…C…S radical to conjugated system,respectively.The elemental analysis results demonstrated that the mol ratio of C,H,N and S in DTC-TETA was about 2:4:1:1.As for UV spectrum of its complexes with Cu(Ⅱ),Cd(Ⅱ),Zn(Ⅱ) and Ni(Ⅱ), there were four new absorption peaks at 321,310,311 and 325 nm,respectively.Coupled to flow-injection,FAAS determination showed that the complexation performance of Cu2+,Cd²⁺,Ni2+ and Zn2+ complexes of DTC-TETA was better than that of sodium diethyldithiocarbamate (DDTC).